Class / Patent application number | Description | Number of patent applications / Date published |
324536000 | By spark or arc discharge | 18 |
20090102489 | Systems and methods for detecting electric discharge - A distributed sensing system for detecting partial electric discharge along the length of an extended object or objects. An optical fiber having a cladding integrated with luminescent material and a silica core of less than 500 micro-meters in diameter with a first reflective end deployed in proximity to test objects. A photo detector is positioned at the second end of the optical sensing fiber and receives and measures both a direct emission light from an electric partial discharge event and the reflected emission light from the reflection end of the optical sensing fiber. The measured signals and their arrival times are used to determine the location and magnitude of a partial electrical discharge. | 04-23-2009 |
20090146666 | PARTIAL DISCHARGE CHARGE QUANTITY MEASURING METHOD AND DEVICE - The present invention comprises an antenna adapted to measure an electromagnetic wave radiated from a device to be measured stemming from partial discharge and having sensitivity at least in the UHF band; a filter for extracting a TEM mode component from a measured time waveform; and a measurement device body including a processing section adapted to obtain a second order integral value of the time waveform having undergone the filter processing and obtain a discharge charge quantity from the value. The present invention also comprises an electromagnetic wave radiation simulating apparatus for inputting a pseudo discharge signal to the device to be measured and previously obtaining the relation between the second order integral value and the discharge charge quantity, wherein the processing section obtains the discharge charge quantity from the second order integral value with reference to the previously obtained relation between the second order integral value and the discharge charge quantity. | 06-11-2009 |
20090284265 | ARC DETECTING DEVICE AND AIRCRAFT EQUIPPED THEREWITH - An arc detecting device includes: a detector for acquiring time series data concerning a characteristic quantity, such as a voltage or a current in a circuit, targeted for detecting an arc; a basic data generator for generating basic data made of a plurality of frequency components, through frequency analysis from the acquired time series data; a data processor for statistically processing the generated basic data, thereby converting the basic data to an evaluation value highly correlative to an occurrence of the arc; and an arc judging unit for judging the occurrence of the arc, if the evaluation value exceeds a predetermined arc judgment threshold value. In this manner, the arc detecting device that is capable of effectively detecting the arc in a direct-current power supply circuit is provided. | 11-19-2009 |
20100013494 | ELECTRICAL PARTIAL DISCHARGE PULSE MARKET DISCRIMINATION - A marker pulse discriminator monitor that enables filtering of partial discharge pulses for monitoring the condition of a generator in a power plant system. The monitor detects partial discharge pulses emanating from the generator and includes a plurality of first modules connected to respective isophase buses adjacent to the generator. Each of the first modules generate a marker pulse in response to a partial discharge pulse. The monitor also includes an analyzer unit connected to the isophase buses adjacent to a step-up transformer. The analyzer unit receives each partial discharge pulse and each marker pulse and determines a differential value corresponding to a difference between a time of arrival of a partial discharge pulse and a time of arrival of a corresponding marker pulse to identify partial discharge pulses originating at the generator and to identify the isophase bus associated with the corresponding partial discharge pulse. | 01-21-2010 |
20100060290 | IDENTIFICATION OF POWER SYSTEM PRIMARY ARCS BASED ON PULSE DENSITY - A diagnostic instrument distinguishes primary arcs from other electrical discharges in an electric power system based on pulse time density of radio frequency noise caused by the discharges. The instrument counts a maximum number of noise pulses in any small time window over a period, and identifies the discharges as primary arcs if the pulse time density is in a range characteristics of primary arcs. | 03-11-2010 |
20100079148 | UHF PARTIAL DISCHARGE AND ITS LOCATION MEASURING DEVICE FOR HIGH-VOLTAGE POWER DEVICES - Disclosed is a UHF partial discharge and its location measuring device for high-voltage power devices. The measuring device includes a partial discharge sensor, an external noise sensor, an analogue-digital converter, a peak detector, a partial discharge signal processor, an arrival time detector, a discharge location processor, and a display unit. | 04-01-2010 |
20100176816 | Partial Corona Discharge Detection - A method of detecting partial corona discharge in a targeted circuit of an electrical apparatus, comprises the steps of: wrapping a Rogowski coil around a leg of the targeted circuit to produce a Rogowski coil signal that represents electrical current rate of change in the leg of the targeted circuit; coupling the Rogowski coil signal to a three-dimensional display device that may represent the dimension of time, the dimension of amplitude as a function of a time, and the dimension of duration of amplitude as a function of time in successive periods of that have a preselected duration; monitoring the display device to detect deviations of the duration of amplitude as a function of time from a normal waveform in the leg of the targeted circuit; and correlating ones of the detected deviations of the duration of amplitude as a function of time from a normal waveform that exceed a preselected deviation level as indicative of partial corona discharge within the targeted circuit. | 07-15-2010 |
20100201370 | Arc Detection - An arc detection system for a plasma generation system includes a radio frequency (RF) sensor that generates first and second signals based on a respective electrical properties of (RF) power that is in communication with a plasma chamber. A correlation module generates an arc detect signal based on the first and second signals. The arc detect signal indicates whether an arc is occurring in the plasma chamber and is employed to vary an aspect of the RF power to extinguish the arc. | 08-12-2010 |
20100201371 | Harmonic Derived Arc Detector - An arc detection system includes a radio frequency (RF) signal probe that senses a RF signal at an input of a RF plasma chamber and that generates a signal based on at least one of the voltage, current, and power of the RF signal. A signal analyzer receives the signal, monitors the signal for frequency components that have a frequency greater than or equal to a fundamental frequency of the RF signal, and generates an output signal based on the frequency components. The output signal indicates that an arc is occurring in the RF plasma chamber. | 08-12-2010 |
20110057662 | Arc Detector And Associated Method For Detecting Undesired Arcs - An arc detector for detecting undesired arcs. The arc detector includes: an antenna for receiving an electromagnetic signal representing an arc; and a discriminator for analysing a signal from the antenna, the discriminator including a spectrum analyser arranged to detect whether the signal represents a normal arc or an undesired arc. The discriminator is arranged to detect whether the signal represents a normal arc or an undesired arc by comparing signal levels at frequencies of a spectrum of the signal corresponding to at least one partial reference spectrum, and determining the arc to be a normal arc if a deviation from the reference spectrum is less than a threshold deviation. A corresponding method is also presented. | 03-10-2011 |
20110273183 | APPARATUS AND METHOD TO DETECT A SERIES ARC FAULT OF AN ELECTRICAL CIRCUIT - An apparatus is for a power circuit providing an alternating current to a load. The apparatus includes a high frequency current sensor structured to cooperate with the power circuit to provide a high frequency current signal. A voltage zero crossing detector is structured to cooperate with the power circuit to provide a voltage zero crossing signal. A high pass filter is structured to provide a filtered current signal from the high frequency current signal. A threshold comparator is structured to provide an output when the filtered current signal exceeds a predetermined value. A processor is structured to receive the voltage zero crossing signal and the output of the threshold comparator and output a trip signal in response to undesired series arcing by detecting an unsymmetrical high frequency signal for a predetermined number of cycles. | 11-10-2011 |
20120105073 | Arrangement for Eliminating Interference from Acoustic Signals in a Ground-Borne Sound Locating Process - An apparatus including a portable receiver with an acoustic sensor and a magnetic field sensor is adapted for locating a fault in an underground electrical line by evaluating ground-borne acoustic signals and electromagnetic signals emitted from a succession of sparking arc-overs caused at the fault location by voltage pulses fed into the electrical line. The apparatus further includes an arrangement for eliminating interference noises from the acoustic signals, wherein the acoustic received signals are delivered to and stored in a memory, and then a respective acoustic signal is processed with reference to a previous stored acoustic signal by a processing algorithm in a processing unit. Start time points of the individual acoustic signals are synchronized with reference to associated electromagnetic signals. A result of the processing algorithm is supplied to an evaluating unit. | 05-03-2012 |
20120112760 | Arc Detection and Prevention in a Power Generation System - A method for arc detection in a system including a photovoltaic panel and a load connectible to the photovoltaic panel with a DC power line. The method measures power delivered to the load thereby producing a first measurement result of the power delivered to the load. Power produced by the photovoltaic panel is also measured, thereby producing a second measurement result of power produced by the photovoltaic panel. The first measurement result is compared with the second measurement result thereby producing a differential power measurement result. Upon the differential power measurement result being more than a threshold value, an alarm condition may also be set. The second measurement result may be modulated and transmitted over the DC power line. | 05-10-2012 |
20140062498 | DEVICE FOR MONITORING INTERNAL ARC IN GAS INSULATED SWITCHGEAR - A device for monitoring internal arc in gas insulated switchgear. The device includes: at least one or more partial discharge sensors that electronic wave signals of partial discharge generated by internal arc in a gas section of the gas insulated switchgear; at least one or more gas pressure wave sensors that measure pressure wave signals due to expansion of a gas produced by internal arc in the gas section of the gas insulated switchgear; a data acquiring unit that receives the electronic wave signals measured by the partial discharge sensors and the pressure wave signals measured by the gas pressure sensors, finds out internal arc on the basis of the received sensor measure information, and determines the reason and the position of the internal ark; and a transmitting unit that transmits the sensor measurement information and determination information from the data acquiring unit to a super-system. | 03-06-2014 |
20140239969 | Method Of Locating An Event Transmitting A Signal - The invention relates to a method and a device for locating an event transmitting a signal, including a set of sensors (A | 08-28-2014 |
20140340096 | Method for Identifying One or More Simultaneously Occurring Partial Discharge Sources - A method for identifying one or more simultaneously occurring partial discharge sources from partial discharge measurement signals of an electrical device to which an AC voltage is applied. A method according to the invention for identifying one or more simultaneously occurring partial discharge sources from partial discharge measurement signals of an electrical device to which an AC voltage is applied, in particular a gas-insulated system, a high-voltage generator, a transformer, an electrical high-voltage power line or an electrical cable, comprises the following steps:
| 11-20-2014 |
20150355307 | METHOD FOR TESTING MAINFRAME PERFORMANCE OF DIFFERENT TYPES OF PARTIAL DISCHARGE DETECTORS BASED ON ANALOG VOLTAGE SIGNAL INJECTION - A method for testing mainframe performance of different types of PD detectors based on analog voltage signal injection, the method comprises: using a function generator ( | 12-10-2015 |
20150377950 | PARTIAL DISCHARGE MONITORING SYSTEM AND PARTIAL DISCHARGE MONITORING METHOD - A partial discharge monitoring system includes: electromagnetic wave detection sensors disposed in insulating gas enclosures being objects to be monitored, converting devices, and an interface device. The interface device includes: a detecting part detecting a zero cross point of a voltage signal synchronous with a voltage signal applied to conductors disposed in the insulating gas enclosures, and deciding a sampling timing of signals of electromagnetic waves; a transmitting part notifying the sampling timing decided by the detecting part to the converting devices; an integrating part integrating digital data which are received from the converting devices on per converting device basis; and a transmitting part transmitting the integrated digital data to a monitoring device. | 12-31-2015 |